00 m below the water surface the roughness inside the

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Unformatted text preview: e diameter.
C6.5 Water at room temperature flows at the same volume flow
rate, Q 9.4 10 4 m3/s, through two ducts, one a round
pipe and one an annulus. The cross-sectional area A of the
two ducts is identical, and all walls are made of commercial
steel. Both ducts are the same length. In the cross sections Design Projects | v v D6.1 A hydroponic garden uses the 10-m-long perforated-pipe system in Fig. D6.1 to deliver water at 20°C. The pipe is 5 cm
in diameter and contains a circular hole every 20 cm. A pump
delivers water at 75 kPa (gage) at the entrance, while the other
end of the pipe is closed. If you attempted, e.g., Prob. 3.125,
you know that the pressure near the closed end of a perforated | e-Text Main Menu | shown in Fig. C6.5 R 15.0 mm and a 25.0 mm.
(a) What is the radius b such that the cross-sectional areas
of the two ducts are identical? (b) Compare the frictional
head loss hf per unit length of pipe for the two cases, assuming fully developed flow. For the annulus, do both...
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